Pop first path from sys.path

According to the `sys.path` documentation “As initialized upon program startup,
the first item of this list, path[0], is the directory containing the script
that was used to invoke the Python interpreter.” Since client is named
`powerline.py` it tries to use the client itself as powerline module and
obviously fails to import `lib` submodule.

client/powerline.py

@@ -12,6 +12,9 @@ try:
 except ImportError:
 	from os import environ
 
+# XXX Hack for importing powerline modules to work.
+sys.path.pop(0)
+
 try:
 	from powerline.lib.encoding import get_preferred_output_encoding
 except ImportError: